<template>
    <div>
       <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 添加角色按钮 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>

            <!-- 角色列表区 -->
            <el-table :data="rolelist" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row  :class="[ 'bdbottom', i1 === 0 ? 'bdtop' : '','vcenter']"  v-for="(item1, i1) in scope.row.children" :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级权限 -->
                            <el-col :span="19">
                                <!-- 通过 for 循环 嵌套渲染二级权限-->
                                <el-row  :class="[i2 === 0 ? '':'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                                    <el-col :span="6"> 
                                        <el-tag  type="success" closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>

                                    <el-col :span="18">
                                        <el-tag type="warning" v-for="(item3, i3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                                    </el-col>

                                </el-row>
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
               <el-table-column type="index"></el-table-column>
               <el-table-column label="角色名称" prop="roleName"></el-table-column>
               <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
               <el-table-column label="操作" width="300px">
                  <template slot-scope="scope">
                      <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
                      <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
                      <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetrightDialog(scope.row)">分配权限</el-button>
                  </template>
               </el-table-column>
            </el-table>
        </el-card>

        <!-- 分配权限的对话框 -->
        <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
            <!-- 树形控件 -->
            <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all  :default-checked-keys="defKeys" ref="treeRef"></el-tree>

            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
       return{
        // 所有角色列表数据
        rolelist:[],
        //控制分配对话框的显示与隐藏
        setRightDialogVisible: false,
        
        //所有权限的数据
        rightslist:[],
        //树形控件的属性绑定对象
        treeProps:{
           label:'authName',
           children: 'children'
        },

        //默认选中的节点Id值数组
        defKeys:[],
        
        //   当前即将分配权限的角色Id
        roleId:''
    
        }
    },

    created(){
        this.getRolesList();
    },

    methods:{
        //获取所有角色的列表
       async getRolesList(){
            const{data: res} = await this.$http.get('roles');
            if (res.meta.status !==200){
                  return this.$message.error('获取角色列表失败！');
            }

            this.rolelist = res.data;
            console.log(this.rolelist)
        },

        //根据id删除对应的权限
        async removeRightById(role, rightId){
            //弹框提示用户是否要删除
            const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(err =>{
                return err
            })

            if(confirmResult !== 'confirm'){
                return this.$message.info('已经取消删除！')
            }
            //console.log('已经确认删除！')
            const {data: res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`);
            if(res.meta.status !== 200){
                return this.$message.error('删除权限失败！')
            }

            //this.getRolesList
            role.children = res.data;

        },

        //展示分配权限的对话框
        async showSetrightDialog(role){
            this.roleId = role.id;
            //获取所有权限的数据
            const{data: res} = await this.$http.get('rights/tree');

            if(res.meta.status !== 200){
                return this.$message.error('获取权限数据失败！')
            }
            
            //把获取到的权限数据保存到 data 中
            this.rightslist = res.data;
            console.log(this.rightslist);

            //  递归获取三级节点的id
            this.getLeafKeys(role, this.defKeys);

            this.setRightDialogVisible = true;
        },

        //通过递归，获取角色下所有三级权限的id，并保存到defKeys 数组中
        getLeafKeys (node, arr){
             // 没有children属性，则是三级节点
            if(!node.children){
                return arr.push(node.id)
            }

            node.children.forEach(item => 
               this.getLeafKeys(item, arr))
        },
        
        //监听分配权限对话框的关闭事件
        setRightDialogClosed(){
            this.defKeys = [];
        },

        //点击为角色分配权限
        async allotRights(){
            const keys= [
                 ...this.$refs.treeRef.getCheckedKeys(),
                 ...this.$refs.treeRef.getHalfCheckedKeys()
            ]
            // join() 方法用于把数组中的所有元素放入一个字符串
            const idStr = keys.join(',');

            const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr });
            if (res.meta.status !== 200) { 
                return this.$message.error('分配权限失败！') 
                }
            this.$message.success('分配权限成功!');
            this.getRolesList();
            this.setRightDialogVisible = false;
        }
        
    }
}
</script>

<style scoped>
.el-tag{
    margin: 7px;
}

.bdtop{
    border-top: 1px solid #eee;
}

.bdbottom{
    border-bottom: 1px solid #eee;
}

.vcenter{
    display: flex;
    align-items: center;
}
</style>